plugin.api.validate: add RegexSchema #4709
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Follow-up of #4691 / #4708
As mentioned in #4702 (comment), non-optional regexes currently don't raise useful error messages when a simple
re.Patternorvalidate.transform(re.Pattern.search)validation is made. TheRegexSchemaraises aValidationErrorwith a proper error message if the return value isNone. See the added tests.validate.regex(RegexSchema) also takes a second parameter which changes the method that's called on the compiled regex pattern. This is useful for callingre.Pattern.findallfor example.